Zeromaru is a fictional character from the Digimon franchise. Zeromaru (or "Zero" for short) is the Digimon partner of Taichi Yagami, and is one of the main characters in the Digimon manga series V-Tamer 01.
Zeromaru is a Veedramon, and throughout the series gains the ability to digivolve into more powerful forms such as AeroVeedramon and UlforceVeedramon. However, he is generally referred to by his name "Zeromaru", and not by the name of his species "Veedramon".
AeroVeedramon is the Ultimate level digivolved form of Veedramon. Zeromaru first digivolves into this form during a fight with Ghoulmon. In this new form, Zeromaru grows wings and is now able to fly and fight in air battles.
In this new form, he fought against many more Digimon enemies before finally facing Arcadimon. During his first battle against this powerful Digimon, he was critically wounded by Arcadimon's special attacks. He was saved with the help of all the other Digimon he and Taichi had met in their journey. The second time he fought Arcadimon, he gained the upper hand, but soon lost again when Neo Saiba used a Digimental to evolve Arcadimon to an even more powerful form. Zeromaru was seemingly killed when he rammed himself into the massive enemy Digimon at full speed.
UlforceVeedramon is Veedramon's final Mega form. Zeromaru first reaches this form during the battle against Arcadimon. Zeromaru had rammed himself with immense speed into Arcadimon, and seemingly died from the attack. However, his data was able to instead reform into his Mega form - UlforceVeedramon. In this form Zeromaru was more than a match for the powerful Arcadimon. Not only was he able to protect his friends from an attack of the evil Digimon with an energy shield, but was also able to hurt the giant Digimon with his "Shining V-Force" attack. He then ripped off Arcadimon's left arm with his "Ulforce Saber" attack.
At this point, Rei, sister to Arcadimon's Tamer Neo, decided she could no longer watch this kind of constant fighting, and threatened to jump off from a cliff. Rei was saved just in time by Zeromaru, and this finally caused Neo to finally realize his wrongdoings. At this point, Daemon, the true evil mastermind in V-Tamer 01, revealed himself to be alive and emerged to fight Zeromaru. Zeromaru fought bravely but was hurt badly when Daemon attacked his friends, thus forcing Zeromaru to protect them with his body. However, when Taichi activated his Digimental, Zeromaru gained strength anew and was able to digivolve into his most powerful form - "UlforceVeedramon Future Mode".
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UlforceVeedramon Future Mode is the most powerful form of Veedramon. Zeromaru reached this form when his tamer Taichi used his Digimental on him.
In this form, Zeromaru was easily able to defeat Daemon and finally killed him by slicing him into two. Afterwards the Digimental (which UlforceVeedramon Future Mode wore as a belt) lost its power and Zeromaru transformed back to UlforceVeedramon.